JPH0413505Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the bottom structure of an underground low temperature storage tank.

[Prior Art] Fig. 3 shows an example of the bottom structure of a conventional underground low-temperature storage tank. Inside the concrete side wall a and the concrete bottom plate b, there is a wall that corresponds to the connecting corner of the concrete members a and b. A membrane g having a curved corner portion c at a position, a vertical portion e having a corrugation d, and a horizontal portion f is provided, and a membrane g is provided in the gap between the membrane g and the concrete members a and b. By providing a heat insulating material (urethane foam) h molded to match, it not only provides heat insulation, but also supports the hydraulic pressure acting on the membrane g and loads due to earthquakes, etc. to the concrete members a and b via the heat insulating material h. I try to let them do it.

[Problems to be solved by the invention] However, the above conventional system has various problems. That is, since the membrane g has a structure having a curved corner part c, it is very difficult to form the heat insulating material h at the corner part to match the curved surface, and it was possible to make it match. However, since the concrete part is subjected to large vertical relative displacements (hydraulic pressure fluctuations, earthquakes, etc.) between the concrete side wall a and the concrete base b, there is a gap between the curved corner part c and the heat insulating material h. There was a risk that an excessive load would be applied to the membrane g (the membrane does not originally have any strength). Additionally, there is a problem in that the heat insulating material h is damaged due to deformation due to stress concentration on the curved corner portion c of the membrane g. In order to solve this problem, it may be possible to provide a corrugation at the curved corner c, but it is technically very difficult to form a corrugation at the curved corner c, which has a complicated shape. Conventionally, a corrugation d was formed at a position as close as possible to the curved corner part c in the vertical and horizontal parts e and f to absorb the relative displacement of the concrete members a and b, but this did not solve the problem as described above. had.

This invention was created by focusing on the above-mentioned circumstances.
The purpose is to provide a highly safe underground low-temperature storage tank by effectively absorbing vertical relative displacement between the concrete side plate and the concrete base due to fluid pressure fluctuations, earthquakes, etc. with a membrane.

[Means for Solving the Problems] The present invention is an attempt to solve the above-mentioned technical problem, by forming an inclined surface inside the concrete side wall and providing anchors at both ends of the inclined surface. A restrained inclined corner part is formed by welding and fixing a membrane inclined part with a corrugation between the anchors, and the corrugation is provided directly above the civil engineering groove formed between the concrete members consisting of the side wall and the bottom plate. In the bottom structure of an underground low temperature storage tank, a bottom structure of an underground low-temperature storage tank is provided with a membrane vertical displacement absorbing part, and a heat insulating material provided between the vertical displacement absorbing part and a concrete member is separated into inner and outer parts in the civil engineering groove. A bottom structure of an underground low-temperature storage tank, characterized in that the concrete member is provided with a support plate capable of absorbing the influence of meandering displacement and supporting the moment load acting on the insulation material by protruding from the civil engineering groove. This is related to.

[Function] Therefore, in the present invention, by configuring the inclined corner portion restrained at the bottom corner of the underground low-temperature storage tank, it is possible to improve the strength of the corner portion and make it easier to manufacture. The corrugation located directly above absorbs vertical displacement,
Furthermore, by supporting the moment load of the heat insulating material with the support plate, vertical displacement between the concrete members can be effectively absorbed and the safety of the storage tank can be improved.

[Examples] Examples of the present invention will be described below based on the drawings.

1 and 2 show an example of the present invention, in which a corner support part 3 having an inclined surface 2 and protruding inward is provided at the inner lower position of a concrete side wall 1, and the corner support part 3 is provided inside the corner support part 3. A civil engineering groove 4 is provided on the periphery to constitute a corrugation bottom plate 5.

Further, anchors 6, 7, and 8 are provided at both ends of the inclined surface 2 on the inner surface of the concrete side wall 1, and at a position inside the civil engineering groove 4 on the upper surface of the concrete base 5, and between the anchors 6 and 7. Welding and fixing the inclined part 10a constituting the membrane having the corrugation 10a' to the corrugation 10a', and welding and fixing the vertical displacement absorbing part 10b of the corrugation 10b' between the anchors 7 and 8,
The lower end of the vertical part 10c having the corrugations 10c' is welded to the anchor 6, and the outer peripheral end of the horizontal part 10d having the corrugations 10d' to the anchor 8 is welded and fixed to the anchor 8 to form the entire membrane 10. Insulating materials 12a, 12b,
12c and 12d are provided.

Furthermore, in the above configuration, the corrugation 1 formed in the vertical displacement absorbing portion 10b of the membrane 10
0b' is formed directly above the civil engineering groove 4 as shown in FIG. 2, and the vertical displacement absorbing portion 10b
The heat insulating material 12b placed in the groove is divided into inner and outer parts 12b' and 12'' by a partition 13 in the upper part of the civil engineering trench 4.
At this time, a support plate 9 for protecting the insulation material 12b against the moment load M acting between the civil engineering grooves 4 of the insulation material 12b via the vertical displacement absorbing portion 10b of the membrane is attached to the concrete bottom plate 5 using anchor bolts 14. Fixed via. In FIG. 2, l indicates a length that is safe due to the strength of the heat insulating materials 12b', 12b'' themselves even if support is omitted, and L indicates the interval between the civil engineering grooves 4.

As mentioned above, the corner part is the inclined surface 2,
Since the inclined part 10a of the membrane is welded and restrained between the anchors 6 and 7 provided at both ends of the inclined surface 2, the inclined part 10a is fixed to the insulation material 12a regardless of the displacement between the concrete members 1 and 5. It can be brought into close contact with the At this time, since the inclined portion 10a has a plate shape parallel to the inclined surface 2, it is easy to form the corrugation 10a'.

Further, when vertical displacement occurs between the concrete members 1 and 5, the space between the insulation materials 12a' and 12a'' moves in the direction of being sheared by the partition 13, and this displacement causes the corrugation 10b' of the vertical displacement absorbing section 10b to move. It will be absorbed by deformation.

Moreover, as shown in FIG. 2, the corrugation 10
The hydraulic pressure acting on b' gathers at the part where the corrugation 10b' is in contact with the insulation material 12b and acts as a load M. Therefore, this load application point is within the interval L of the civil engineering trench 4. When the load is on the heat insulating material 12b, the moment M acts on the heat insulating material 12b, but by receiving this with the support plate 9, the heat insulating material 12b can be protected.
Therefore, the support plate 9 can be attached to the corner support 3 of the concrete side wall 1 depending on the location of the load application point.
It may be provided on the side or on both the concrete members 1 and 5, and its overhang length can be arbitrarily selected depending on the interval L between the civil engineering grooves 4. Further, it goes without saying that if the distance L is small and the point of action of M is not within the distance L, the support plate 9 can be omitted.

[Effect of the invention] As described above, according to the bottom structure of the underground cryogenic storage tank of the invention, by configuring the inclined corner portion restrained by the anchor,
The strength of the corner part is improved, manufacturing is made easier, the vertical displacement between concrete members is absorbed by the corrugation installed directly above the civil engineering groove, and the moment load acting on the insulation material in the civil engineering groove is reduced. By supporting the concrete members by the support plates, vertical displacements of the concrete members can be concentrated and safely and reliably absorbed, thereby achieving an excellent effect of improving the health of the storage tank. Further, the support plate described above can be an effective means for solving the installation error (meandering displacement) between the corrugation and the civil engineering groove provided directly above the civil engineering groove.

[Brief explanation of drawings]

FIG. 1 is a cutaway side view showing an embodiment of the present invention;
FIG. 2 is a partially enlarged detailed view of FIG. 1, and FIG. 3 is an explanatory diagram showing an example of a conventional structure. 1 is a concrete side wall, 2 is an inclined surface, 3 is a corner support part, 4 is a civil engineering groove, 5 is a concrete bottom plate, 6, 7, 8 are anchors, 9 is a support plate, 10 is a membrane, 10a is an inclined part, 10b is Vertical displacement absorption part, 10c is a vertical part, 10d is a horizontal part, 10
a', 10b', 10c', 10d' are corrugations,
11 is a welding fixing part, 12a, 12b, 12c, 1
2d indicates a heat insulating material.

Claims (1)

[Scope of utility model registration request] Forming an inclined surface on the inside of the concrete side wall, providing anchors at both ends of the inclined surface, and welding and fixing a membrane inclined portion having a corrugation between the anchors to form a restrained inclined corner portion, In addition, a membrane vertical displacement absorbing section having a corrugation is provided directly above the civil engineering groove formed between the concrete members consisting of the side walls and the bottom plate, and a heat insulating material is provided between the vertical displacement absorbing section and the concrete member. In the bottom structure of the underground low temperature storage tank, which is separated into the inner and outer parts in the civil engineering groove, the effect of meandering displacement of the civil engineering groove can be absorbed, and the moment load acting on the heat insulating material is supported by protruding into the civil engineering groove. A bottom structure of an underground low-temperature storage tank, characterized in that a supporting plate as described above is provided on the concrete member.